Liquid crystal/polymer composite electric control dimming film and preparation method thereof

A polymer, dimming film technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of single function, limited application, difficult production, etc., and achieve the effect of reducing the driving voltage and the difficulty of orientation

Active Publication Date: 2022-07-22
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the PSLC film, the content of the polymer network is low, usually below 10%, resulting in a low peel strength between the two substrates of the PSLC film, which makes it difficult to make this film on a flexible substrate with a large area, which limits PSLC. Application range of thin film
There are also some PSLC materials with a very high polymer network content, but this kind of material with a high polymer network content will have a simplification of functions, such as being unable to be driven by an electric field, which will lead to its application limited

Method used

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  • Liquid crystal/polymer composite electric control dimming film and preparation method thereof
  • Liquid crystal/polymer composite electric control dimming film and preparation method thereof
  • Liquid crystal/polymer composite electric control dimming film and preparation method thereof

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preparation example Construction

[0074] The present invention also provides a method for preparing a liquid crystal / polymer composite electronically controlled dimming film, the method comprising the following steps:

[0075] 1) Mix the liquid crystal material, the first polymerizable monomer, the second polymerizable monomer, the first initiator, the second initiator, and the spacer particles to obtain a uniform mixture;

[0076] 2) The above mixture is filled between the two superimposed ITO conductive films to prepare a thin film, and under the condition of light irradiation or heating, the first polymerizable monomer is initiated by the first initiator to undergo photopolymerization or thermal polymerization to form a thin film. Porous microstructured polymer matrix, and the liquid crystal material is dispersed in the polymer matrix in the form of liquid crystal droplets;

[0077] 3) Apply an electric field to the film to make the liquid crystal material molecules and the second polymerizable monomer mole...

Embodiment 1

[0095] The names and proportions of the selected liquid crystal material, the first polymerizable monomer, the second polymerizable monomer, the first initiator, the second initiator, and the spacer particles are listed in Table 1, and the total mass of the mixture is 15 g; 1. The materials are stirred at room temperature to form an isotropic liquid, mixed evenly, sandwiched between two ITO conductive plastic films plated with indium tin oxide, the size of the ITO conductive plastic film is 0.4*0.4 m², and the film is formed by rolling evenly; The film was irradiated with ultraviolet light with a wavelength of 365 nm at room temperature, and the ultraviolet light intensity was 5.0 mw / cm 2 , the irradiation time was 10 min, and the first polymerization (photopolymerization) was carried out. Subsequently, a voltage of 50 Hz and 100 V was applied to the film, and then the film was placed in a 70° C. oven for 5 hours for the second polymerization (thermal polymerization) to obtain...

Embodiment 2

[0100] The names and proportions of the selected liquid crystal material, the first polymerizable monomer, the second polymerizable monomer, the first initiator, the second initiator, and the spacer particles are listed in Table 2, and the total mass of the mixture is 15 g. The raw materials in Table 2 were stirred at room temperature (25 °C) to form an isotropic liquid, mixed evenly, and sandwiched between two ITO conductive plastic films plated with indium tin oxide. The size of the ITO conductive plastic film was 0.4*0.4 m². Roll evenly to form a film; at room temperature (25 °C), the film is irradiated with ultraviolet light with a wavelength of 365 nm, and the ultraviolet light intensity is 5.0 mw / cm 2 , the irradiation time was 3-5 min, and the first polymerization (photopolymerization) was carried out; then a voltage of 1000 Hz 100 V was applied to the film, and then at 25 °C, ultraviolet light with a wavelength of 254 nm was used for irradiation, UV light intensity is ...

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Abstract

The invention relates to a liquid crystal / polymer composite electric control dimming film and a preparation method thereof, the liquid crystal / polymer composite electric control dimming film comprises a liquid crystal material, a polymer matrix and two layers of ITO conductive films, the polymer matrix is of a porous microstructure and is clamped between the two layers of ITO conductive films, the liquid crystal material is dispersed in the polymer matrix to form liquid crystal microdroplets, and the liquid crystal microdroplets are dispersed in the polymer matrix. The liquid crystal microdroplets have a vertically oriented polymer network; the polymer matrix is prepared from a first polymerizable monomer through first-step photopolymerization or thermal polymerization, and the macromolecular network is prepared from a second polymerizable monomer through second-step photopolymerization or thermal polymerization. A two-step polymerization method is adopted, firstly, a polymer matrix of a porous microstructure similar to PDLC is constructed through first-step polymerization, then a vertically-oriented polymer network is constructed in liquid crystal microdroplets through second-step polymerization, and therefore the unique composite microstructure is achieved.

Description

technical field [0001] The invention relates to the field of optical films, in particular to a liquid crystal / polymer composite electronically controlled dimming film and a preparation method thereof. Background technique [0002] In the practical application field of liquid crystal, there are two main fields, one is the display screen, and the other is the optical film. In the process of preparing optical films, in order to achieve roll-to-roll large-scale processing, liquid crystals and polymer materials are usually combined to prepare composite films, so that the films can have both the excellent external field responsiveness of liquid crystals and the excellent properties of polymers. mechanical properties. At present, there are two main types of electronically controlled dimming films that can be driven by an electric field. One is Polymer Dispersed Liquid Crystal (PDLC) films, and the other is Polymer Stabilized Liquid Crystal (PSLC) films. [0003] In PDLC films, li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1334C08F220/20C08F220/18C08F222/14C08F222/20C08G59/66
CPCG02F1/1334C08F220/20C08G59/66C08F220/1811C08F222/1063C08F222/1025
Inventor 杨槐王孝张兰英
Owner PEKING UNIV
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